Create an account
what are the methods for pre-natal diagnosis
AFP, triple marker screen, quadruple marker screen, chorionic villus sampling, ultrascreen, US, amniocentesis
what is maternal serum alpha fetoprotein (MS-AFP)
produced in fetal liver cells, found in ammniotic fluid and meternal blood
what is a quadruple screen
inhibin-A + MS-AFP, estriol, B hCG (triple screen); hormone in blood made by placenta
how is chorionic villus sampling done
Catheter passed through cervix into uterus to developing placenta utilizing ultrasound
what is an ultrascreen
Measures blood protein levels and ultrasound for nuchal translucency (thickness of skin on back of fetal neck
what is US used for
detects anomalies, twins, placenta location, abnormal pregnancy, gestational age
what is gestational age dependent on
Abdominal circumference, Head circumference, Biparietal diameter of head, Femur length, Crown to rump length (first trimester)
internal fetal monitoring
fetal scalp electrode, xervix must be dilated and membranes ruptured, high quality recordings.
external fetal monitoring
transducer on mother's abdomen. Does not require cervical dilation or membrane rupture. FHR quality varies with position and maternal obesity
what are accelerations
Seen with fetal movement or stimulation. Abrupt
increase in fetal heart rate above baseline
what are early deceleration
Decrease in response to contractions.; Onset with onset of contractions, duration is
length of contraction
why do early deceleration happen
Due to fetal head compression during contraction resulting in fetal vagal stimulation
what is non reactive NST
Accelerations not present. Fetus can be compromised, asleep, immature, or sedated
what is a contraction stress test (CST)
Uterine contractions decrease blood flow to the placenta. Need spontaneous contractions or contractions induced by oxytocin.
what is a biophysical profile
5 parameters, two points each: NST reactivity, extremity tone, chest wall movements, gross body movements, amniotic fluid volume
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together